Are you missing anything? Or did the player steal from you? Im not exactly sure what the issue is...so far what I have got is, that possibly, some VIP, flew into your horse shed and that a zombie chased them out? Or are you saying that the user War101 could possibly be hacking?
Could you please message me in game, make a modreq, or reply back here, supplying us with more information regarding this report.
P.S If you can try to post those screenshots again, that would be great.
To screenshot (For Windows), press f2, and it will save your screenshot to your .minecraft folder in the screenshots folder. To get to your .minecraft folder, open "run" by pressing windows key+R then typing %appdata%. You will find your .minecraft folder there.